Check your display cable (both laptops and desktops) Cables can work
themselves loose. Check both the connector on the computer, as well as
the connection on the display.
If you have multiple monitors, check connections on each display. Sometimes if one comes loose, the others only show part of the Windows or Mac interface. For Laptops, check to make sure the display is set to output to the correct display (check the icons on your keyboard, but hitting Fn-F7 cycles through the settings on some laptops).
If you have multiple monitors, check connections on each display. Sometimes if one comes loose, the others only show part of the Windows or Mac interface. For Laptops, check to make sure the display is set to output to the correct display (check the icons on your keyboard, but hitting Fn-F7 cycles through the settings on some laptops).
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